我正在努力學習自己使用 Qt，所以仍然很掙扎......我將如何通過按下洗掉按鈕來洗掉我的彈跳物件？我正在努力實作洗掉功能......
MainWindow::MainWindow(QWidget * parent): QMainWindow(parent) {
setFixedSize(800, 600);
int start;
timer = new QTimer(this);
connect(timer , SIGNAL(timeout()), this, SLOT(step()));
timer -> setInterval(5);
timer -> start();
QPushButton * sillyLabel = new QPushButton(this);
connect(sillyLabel , SIGNAL(clicked()), this, SLOT(doSomethingSilly()));
sillyLabel -> setText("Spawn Object");
sillyLabel -> setGeometry(400, 400, 200, 50);
QPushButton * dLabel = new QPushButton(this);
connect(dLabel , SIGNAL(clicked()), this, SLOT(deleteSomethingSilly()));
dLabel -> setText("Delete Object");
dLabel -> setGeometry(200, 200, 200, 50);
MainWindow::~MainWindow() {
}
void MainWindow::doSomethingSilly() {
QProgressBar * sillyobject = new QProgressBar(this);
sillyobject -> setGeometry(400, 300, 80, 50);
sillyobject -> show();
sillyobject -> setValue(100);
bouncyobject.push_back(sillyobject);
}
void MainWindow::deleteSomethingSilly() {
delete ?;
}
uj5u.com熱心網友回復：
您必須在類頭中將 sillyobject 宣告為私有指標（以訪問所有類成員），然后您只需使用以下命令洗掉指標：
delete sillyobject;
在您的頭檔案中：
(...)
private :
QProgressBar * sillyobject
(...)
然后
void MainWindow::doSomethingSilly() {
sillyobject = new QProgressBar(this);
sillyobject -> setGeometry(400, 300, 80, 50);
sillyobject -> show();
sillyobject -> setValue(100);
bouncyobject.push_back(sillyobject);
}
和 ：
void MainWindow::deleteSomethingSilly() {
delete sillyobject;
}
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